1. 6-3 Bellwork Solve each system by using substitution
1.) 7x – 2y = 1
2y = x -1
2.) 2x + 3y = 144
y – x = 24

2. Bellwork Solve for y 1.) 2x -4y = 8 2.) – x + y = 2 Solve for x

3. 6-3 (Part 1) - Solving Systems by Elimination
Algebra 1

4. When to use Add. Or Subt. to eliminate a variable for linear combination
Use addition to eliminate a variable when the coefficients are opposites.
Use subtraction to eliminate a variable when the coefficients are the same.

5. Example 1 - Solve
4x-3y=11
2x+3y=13
(4, 5/3)

6. Example 2 - Solve
8a+b=1
8a-3b=3
(3/16, -1/2)

7. Example 3 – Arranging like terms
x + 3y = 12
-3y + x = 30

8. Example 4 – Arranging like terms
y = x – 9
x + 8y = 0